Abstract
The presence of UV‐absorptive substances in the epidermal cells of leaves is thought to protect mesophyll tissues from the harmful effects of UV‐B radiation. We examined the influence of short‐term UV‐B exposures on UV‐absorptive (330 nm) sinapates and flavonols, and on shoot growth of the Arabidopsis wild type ecotype Landsberg erecta and two mutants. 114 deficient in chalcone synthase, and 115 , deficient in chalcone/flavonone isomerase. Sequential ozone exposures were used to determine the effects of oxidative stress The levels of sinapates and flavonols on a leaf fresh weight basis increased substantially in the wild type and sinapates increased in the 114 mutant in vegetative vegetative/reproductive transitional and reproductive stage plants in response to short‐term (48h) UV‐B radiation. When UV‐B was discontinued the levels generally decreased lo pre‐exposure levels after 48 h in vegetative/reproductive but not in reproductive plants. Exposure to ozone before or alter UV‐B treatment did not consistently affect the levels of these UV‐absorptive compounds. Dry matter accumulation was less affected by UV‐B at the vegetative and reproductive stages than at the vegetative/reproductive stage. At the vegetative/reproductive stage, shoot growth of all 3 genotypes was retarded by UV‐B. Growth was not retarded by short‐term ozone exposure alone but when exposure to ozone followed UV‐B exposure, growth was reduced in all genotypes. Leaf cupping appeared on 115 plants exposed to UV‐B.
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Claims 9
Claim · model-written summary
UV-B increased leaf sinapate and flavonol levels in wild type plants.
- Taxon
- Arabidopsis
Arabidopsist0 - Material
- wild typee0
- Treatment
- short‐term (48h) UV‐B radiatione0
- Outcome
- levels of sinapates and flavonolse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of sinapates and flavonols on a leaf fresh weight basis increased substantially in the wild type and sinapates increased in the 114 mutant in vegetative vegetative/reproductive transitional and reproductive stage plants in response to short‐term (48h) UV‐B radiation.”
t0“Arabidopsis”
Claim · model-written summary
UV-B increased sinapate levels in the 114 mutant.
- Taxon
- ArabidopsisArabidopsist0
- Material
- 114 mutante0
- Treatment
- short‐term (48h) UV‐B radiatione0
- Outcome
- sinapatese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sinapates increased in the 114 mutant in vegetative vegetative/reproductive transitional and reproductive stage plants in response to short‐term (48h) UV‐B radiation.”
t0“Arabidopsis”
Claim · model-written summary
After UV-B ended, absorptive compounds generally fell to pre-exposure levels in transitional but not reproductive plants.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- vegetative/reproductivee0
- Outcome
- levelse0
- Direction
- decreasede0
- Value
- 48 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When UV‐B was discontinued the levels generally decreased lo pre‐exposure levels after 48 h in vegetative/reproductive but not in reproductive plants.”
t0“Arabidopsis”
Claim · model-written summary
Ozone before or after UV-B did not consistently alter UV-absorptive compounds.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Exposure to ozone before or alter UV‐B treatmente0
- Outcome
- levels of these UV‐absorptive compoundse0
- Direction
- did not consistently affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Exposure to ozone before or alter UV‐B treatment did not consistently affect the levels of these UV‐absorptive compounds.”
t0“Arabidopsis”
Claim · model-written summary
UV-B affected dry matter less at vegetative and reproductive stages than at the transitional stage.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- vegetative and reproductive stagese0
- Treatment
- UV‐Be0
- Outcome
- Dry matter accumulatione0
- Direction
- less affectede0
- Comparator
- vegetative/reproductive stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter accumulation was less affected by UV‐B at the vegetative and reproductive stages than at the vegetative/reproductive stage.”
t0“Arabidopsis”
Claim · model-written summary
UV-B retarded shoot growth of all three genotypes at the transitional stage.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- vegetative/reproductive stagee0
- Treatment
- UV‐Be0
- Outcome
- shoot growthe0
- Direction
- retardede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the vegetative/reproductive stage, shoot growth of all 3 genotypes was retarded by UV‐B.”
t0“Arabidopsis”
Claim · model-written summary
Short-term ozone exposure alone did not retard growth.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- short‐term ozone exposure alonee0
- Outcome
- Growthe0
- Direction
- not retardede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth was not retarded by short‐term ozone exposure alone”
t0“Arabidopsis”
Claim · model-written summary
Ozone exposure following UV-B reduced growth in all genotypes.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- exposure to ozone followed UV‐B exposuree0
- Outcome
- growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when exposure to ozone followed UV‐B exposure, growth was reduced in all genotypes.”
t0“Arabidopsis”
Claim · model-written summary
UV-B exposed 115 plants developed leaf cupping.
- Taxon
- ArabidopsisArabidopsist0
- Material
- 115e0
- Treatment
- UV‐Be0
- Outcome
- Leaf cuppinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf cupping appeared on 115 plants exposed to UV‐B.”
t0“Arabidopsis”
The same questions in other papers
ozone · growth · ArabidopsisPositive and negative results
1 in the opposite direction
- positive
uv · growth · ArabidopsisPositive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.